Esempio n. 1
0
  private void test3()
      throws UtilityException, SocketException, UnknownHostException, IOException,
          MessageAttributeParsingException, MessageAttributeException,
          MessageHeaderParsingException {
    int timeSinceFirstTransmission = 0;
    int timeout = timeoutInitValue;
    while (true) {
      try {
        // Test 3 including response
        DatagramSocket sendSocket = new DatagramSocket(new InetSocketAddress(localAddress, 0));
        sendSocket.connect(InetAddress.getByName(stunServer), stunPort);
        sendSocket.setSoTimeout(timeout);

        MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
        sendMH.generateTransactionID();

        ChangeRequest changeRequest = new ChangeRequest();
        changeRequest.setChangePort();
        sendMH.addMessageAttribute(changeRequest);

        byte[] data = sendMH.getBytes();
        DatagramPacket send = new DatagramPacket(data, data.length);
        sendSocket.send(send);
        LOGGER.debug("Test 3: Binding Request sent.");

        int localPort = sendSocket.getLocalPort();
        InetAddress localAddress = sendSocket.getLocalAddress();

        sendSocket.close();

        DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
        receiveSocket.connect(InetAddress.getByName(stunServer), ca.getPort());
        receiveSocket.setSoTimeout(timeout);

        MessageHeader receiveMH = new MessageHeader();
        while (!(receiveMH.equalTransactionID(sendMH))) {
          DatagramPacket receive = new DatagramPacket(new byte[200], 200);
          receiveSocket.receive(receive);
          receiveMH = MessageHeader.parseHeader(receive.getData());
          receiveMH.parseAttributes(receive.getData());
        }
        ErrorCode ec =
            (ErrorCode)
                receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
        if (ec != null) {
          di.setError(ec.getResponseCode(), ec.getReason());
          LOGGER.debug("Message header contains an Errorcode message attribute.");
          return;
        }
        if (nodeNatted) {
          di.setRestrictedCone();
          LOGGER.debug("Node is behind a restricted NAT.");
          return;
        }
      } catch (SocketTimeoutException ste) {
        if (timeSinceFirstTransmission < timeoutTest) {
          LOGGER.debug("Test 3: Socket timeout while receiving the response.");
          timeSinceFirstTransmission += timeout;
          int timeoutAddValue = (timeSinceFirstTransmission * 2);
          if (timeoutAddValue > timeoutSecond) // 1600)
          timeoutAddValue = timeoutSecond;
          timeout = timeoutAddValue;
        } else {
          LOGGER.debug(
              "Test 3: Socket timeout while receiving the response. Maximum retry limit exceed. Give up.");
          di.setPortRestrictedCone();
          LOGGER.debug("Node is behind a port restricted NAT.");
          return;
        }
      }
    }
  }
Esempio n. 2
0
  private boolean test2()
      throws UtilityException, SocketException, UnknownHostException, IOException,
          MessageAttributeParsingException, MessageAttributeException,
          MessageHeaderParsingException {
    int timeSinceFirstTransmission = 0;
    int timeout = timeoutInitValue;
    while (true) {
      try {
        // Test 2 including response
        DatagramSocket sendSocket = new DatagramSocket(new InetSocketAddress(localAddress, 0));
        sendSocket.connect(InetAddress.getByName(stunServer), stunPort);
        sendSocket.setSoTimeout(timeout);

        MessageHeader sendMH = new MessageHeader(MessageHeader.MessageHeaderType.BindingRequest);
        sendMH.generateTransactionID();

        ChangeRequest changeRequest = new ChangeRequest();
        changeRequest.setChangeIP();
        changeRequest.setChangePort();
        sendMH.addMessageAttribute(changeRequest);

        byte[] data = sendMH.getBytes();
        DatagramPacket send = new DatagramPacket(data, data.length);
        sendSocket.send(send);
        LOGGER.debug("Test 2: Binding Request sent.");

        int localPort = sendSocket.getLocalPort();
        InetAddress localAddress = sendSocket.getLocalAddress();

        sendSocket.close();

        DatagramSocket receiveSocket = new DatagramSocket(localPort, localAddress);
        receiveSocket.connect(ca.getAddress().getInetAddress(), ca.getPort());
        receiveSocket.setSoTimeout(timeout);

        MessageHeader receiveMH = new MessageHeader();
        while (!(receiveMH.equalTransactionID(sendMH))) {
          DatagramPacket receive = new DatagramPacket(new byte[200], 200);
          receiveSocket.receive(receive);
          receiveMH = MessageHeader.parseHeader(receive.getData());
          receiveMH.parseAttributes(receive.getData());
        }
        ErrorCode ec =
            (ErrorCode)
                receiveMH.getMessageAttribute(MessageAttribute.MessageAttributeType.ErrorCode);
        if (ec != null) {
          di.setError(ec.getResponseCode(), ec.getReason());
          LOGGER.debug("Message header contains an Errorcode message attribute.");
          return false;
        }
        if (!nodeNatted) {
          di.setOpenAccess();
          LOGGER.debug(
              "Node has open access to the Internet (or, at least the node is behind a full-cone NAT without translation).");
        } else {
          di.setFullCone();
          LOGGER.debug("Node is behind a full-cone NAT.");
        }
        return false;
      } catch (SocketTimeoutException ste) {
        if (timeSinceFirstTransmission < timeoutTest) {
          LOGGER.debug("Test 2: Socket timeout while receiving the response.");
          timeSinceFirstTransmission += timeout;
          int timeoutAddValue = (timeSinceFirstTransmission * 2);
          if (timeoutAddValue > timeoutSecond) // 1600)
          timeoutAddValue = timeoutSecond;
          timeout = timeoutAddValue;
        } else {
          LOGGER.debug(
              "Test 2: Socket timeout while receiving the response. Maximum retry limit exceed. Give up.");
          if (!nodeNatted) {
            di.setSymmetricUDPFirewall();
            LOGGER.debug("Node is behind a symmetric UDP firewall.");
            return false;
          } else {
            // not is natted
            // redo test 1 with address and port as offered in the changed-address message attribute
            return true;
          }
        }
      }
    }
  }